clang -fsanitize=alignment crashes with __builtin_assume_aligned

[m-gupta]

// clang -c -fsanitize=alignment test.c
int main ()
{
(void) __builtin_assume_aligned("", 1);
  return 0;
}

llvm/llvm-project/clang/include/clang/AST/Type.h:691: const ExtQualsTypeCommonBase *clang::QualType::getCommonPtr() const: Assertion `!isNull() && "Cannot retrieve a NULL type pointer"' failed.

@vitalybuka can you please check?

[inclyc]

This assertion fail seems to exist only when -fsanitize=alignment is enabled

https://godbolt.org/z/z8h3x7zd3

[llvmbot]

@llvm/issue-subscribers-clang-frontend

[llvmbot]

@llvm/issue-subscribers-clang-codegen

[int6]

Thanks for your fix @yronglin

[AaronBallman]

Fixed by https://github.com/llvm/llvm-project/commit/6ed21fc515230ac2ea459d8aa90566e9a467bbb0